3 years ago

Which algebraic formula could be used to solve this equation...

Mathematics

1 answer:

Bas_tet [7]3 years ago

3 0

Your answer is going to be A

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Solve x2 + 2x + 9 = 0

Keith_Richards [23]

$x^2+2x+9=0 \\ \\
a=1 \\ b=2 \\ c=9 \\ b^2-4ac=2^2-4 \times 1 \times 9=4-36=-32 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-2 \pm \sqrt{-32}}{2 \times 1}=\frac{-2 \pm \sqrt{-16 \times 2}}{2}=\frac{-2 \pm 4i\sqrt{2}}{2}=-1 \pm 2i\sqrt{2}$

The answer is D.

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4 years ago

Simplify 3 3^square root of 16

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3 years ago

A shop is opened at 7.45 am and closed at 6.30 pm on each day from Monday to Friday. Calculate the total time the shop is opened

Sliva [168]

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53 hours and 45 minutes

Step-by-step explanation:

since they open for 10 hours and 45 minutes a day.

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